◎ 题干
You must keep your eyes      if you are going to make your trip      enjoyable and worthwhile.
A, opened, to be     B, open, to be             C, opened,  be         D, open,  /
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“You must keep your eyes if you are going to make your trip enjoyable and worthwhile.A, opened, to be B, open, to be C, opened, be D, open, /…”主要考查了你对  【动词短语】【动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。